Very little can be sent out, sugar (7)
I believe the answer is:
sweeten
'sugar' is the definition.
(I've seen this before)
'very little can be sent out' is the wordplay.
'very little' becomes 'wee'.
'can be' is an anagram indicator.
'out' is an insertion indicator.
'sent' is an anagram of 'sten'.
'wee' put into 'sten' is 'SWEETEN'.
(Other definitions for sweeten that I've seen before include "temper" , "Appease" , "We teens! (anag)" , "Make less bitter" , "Make sugary or saccharine" .)