Edward possesses leg with firm muscles perhaps (5)
I believe the answer is:
toned
'firm muscles perhaps' is the definition.
I can't judge whether this definition defines the answer.
'edward possesses leg' is the wordplay.
'edward' becomes 'ted'.
'possesses' means one lot of letters goes inside another.
'leg' becomes 'on' (cricket term, fielding positions).
'ted' going around 'on' is 'TONED'.
'with' acts as a link.
Can you help me to learn more?
(Other definitions for toned that I've seen before include "In good condition (of muscles or skin)" , "went well" , "Having firm and well-developed muscles" , "Noted (anag.)" , "Well-muscled" .)