Getting on and being in harmony but not touching (6)
I believe the answer is:
ageing
'getting on' is the definition.
('age' can be a synonym of 'get on')
'being in harmony but not touching' is the wordplay.
'being in harmony' becomes 'agreeing' (I've seen this before).
'but not' suggests deleting specific letters.
'touching' becomes 're' (re can mean touching or regarding).
'agreeing' with 're' removed is 'AGEING'.
'and' acts as a link.
(Other definitions for ageing that I've seen before include "Getting older" , "getting more advanced?" , "Growing old" , "rather old" , "Growing older" .)