Exercise skill returning home (5)
I believe the answer is:
train
'exercise' is the definition.
(training is a kind of exercising)
'skill returning home' is the wordplay.
'skill' becomes 'art' (I've seen this before).
'returning' says the letters should be written in reverse.
'home' becomes 'in' ('he's home' can mean 'he's in').
'art' in reverse letter order is 'tra'.
'tra'+'in'='TRAIN'
(Other definitions for train that I've seen before include "Teach, retinue" , "Succession of carriages" , "Linked carriages" , "Prepare oneself by exercising" , "one thing after another" .)