One who doesn't mind being told to take a hike? (7)
I believe the answer is:
rambler
'one who doesn't mind' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'being told to take a hike?' is the wordplay.
'being' becomes 'man' (human being).
'told' shows a homophone (sound like).
'to take a hike?' becomes 'bler' (I can't justify this - if you can you should give a lot more credence to this answer).
'man' is a homophone of 'ram'.
'ram'+'bler'='RAMBLER'
Can you help me to learn more?
(Other definitions for rambler that I've seen before include "Hiker" , "Countryside walker" , "taker of country walks" , "Presumably one goes on" , "Rover" .)