Tough (4-6)

'tough' is the definition.
(similar in meaning)
This is the entire clue.
(Other definitions for hard-bitten that I've seen before include "Cynical and ruthless" , "Tough, cynical" .)
'tough' is the definition.
(I know that tough can be written as hard)
This is the entire clue.
(Other definitions for hard that I've seen before include "Difficult - firm" , "impenetrable" , "Emergency lane" , "Newspaper's sure" , "Novel featuring Mr Gradgrind" .)
(Other definitions for semi that I've seen before include "House sharing a wall" , "Prefix meaning half or partly" , "Prefix denoting half" , "Common type of house" , "House; match" .)
'tough' is the definition.
(I know that tough can be written as goon)
This is the entire clue.
(Other definitions for goon that I've seen before include "Stupid person" , "SPIKE] ?" , "He's very stupid" , "Hired thug" , "person making fool of himself" .)
'tough' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for hardy that I've seen before include "Stalwart" , "relatively able to endure exposure" , "Courageous" , "standing the test of time?" , "Author Thomas?" .)
'tough' is the definition.
(similar in meaning)
This is the entire clue.
(Other definitions for leathery that I've seen before include "Tough like tanned hide" , "like old boots?" , "Tough-textured" , "Like a football" , "rather tough" .)
'tough' is the definition.
(similar in meaning)
This is the entire clue.