On piano in group to admire (7)
I believe the answer is:
respect
'admire' is the definition.
(I've seen this before)
'on piano in group' is the wordplay.
'on' becomes 're' ('on' can be mean 'with reference to').
'piano' becomes 'p'.
'in' indicates putting letters inside.
'group' becomes 'sect' (I've seen this in other clues).
'p' placed within 'sect' is 'spect'.
're'+'spect'='RESPECT'
'to' is the link.
(Other definitions for respect that I've seen before include "Scrupulously heed" , "'Regard, esteem (7)'" , "Avoid offending" , "Show deference (to)" , "Treat with care, deference" .)