Muscular learner in Greater Manchester town (5)
I believe the answer is:
burly
'muscular' is the definition.
(thesaurus)
'learner in greater manchester town' is the wordplay.
'learner' becomes 'l' (as in a learner driver with L-plates on their car).
'in' indicates putting letters inside.
'greater manchester town' becomes 'bury' (Bury is a town in Greater Manchester).
'l' put within 'bury' is 'BURLY'.
(Other definitions for burly that I've seen before include "Strong and heavy in build" , "Muscular and heavily built" , "Strongly and heavily built" , "Big and sturdy" , "Sturdily built" .)