Man perhaps in gym getting tender on the outside (5)
I believe the answer is:
biped
'man' is the definition.
(humans are an example)
'in gym getting tender on the outside' is the wordplay.
'in gym getting' becomes 'pe' (I am not sure about this - if you are sure you should believe this answer much more).
'tender' becomes 'bid' (synonyms).
'on the outside' indicates putting letters inside.
'pe' inserted inside 'bid' is 'BIPED'.
'perhaps' acts as a link.
Can you help me to learn more?
(Other definitions for biped that I've seen before include "Two-legged animal" , "Two-footed animal" , "Girl, say" , "One walking on two feet" , "Two-legged creature" .)