Provide or supply only a blend (3,2)
I believe the answer is:
lay on
'provide' is the definition.
(I've seen this before)
'only a blend' is the wordplay.
'blend' indicates an anagram (I've seen 'blending' mean this (letters blended or mixed into a new form)).
'only'+'a'='onlya'
'onlya' anagrammed gives 'LAY ON'.
'or supply' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for lay on that I've seen before include "Provide (something)" , "Provide (food, etc)" , "instruction for Macduff" .)