Is good for honey producers around summits, hills and valleys (7)
I believe the answer is:
behaves
'is good' is the definition.
(I've seen this before)
'honey producers around summits hills and valleys' is the wordplay.
'honey producers' becomes 'bees' (I've seen this before).
'around' means one lot of letters goes inside another.
'summits' suggests taking the first letters (I've seen 'summit of' mean this).
The first letters of 'hills and valleys' is 'hav'.
'bees' going around 'hav' is 'BEHAVES'.
'for' is the link.
(Another definition for behaves that I've seen is " is good".)