To one fellow, looked in harmony (5)
I believe the answer is:
toned
'looked in harmony' is the definition.
The definition and answer can be both related to bodily activities as well as being past participle verbs.
Perhaps there's a link between them I don't understand?
'to one fellow' is the wordplay.
'one fellow' becomes 'ned' (I can't explain this - if you can you should believe this answer much more).
'to'+'ned'='TONED'
Can you help me to learn more?
(Other definitions for toned that I've seen before include "In good condition (of muscles or skin)" , "Slightly tinted; firm-muscled" , "Well-muscled" , "Braced" , "Muscular" .)