A soft fruit to become visible (6)
I believe the answer is:
appear
'become visible' is the definition.
(thesaurus)
'a soft fruit' is the wordplay.
'soft' becomes 'p' (musical abbreviation for 'piano').
'fruit' becomes 'pear' (pear is a kind of fruit).
'a'+'p'+'pear'='APPEAR'
'to' acts as a link.
(Other definitions for appear that I've seen before include "Become visible as ghost might" , "Perform" , "Arrive" , "become available" , "Seem or materialise" .)