Make available only a possibility (3,2)
I believe the answer is:
lay on
'make available' is the definition.
Although both the answer and definition are verbs in their base form, I can't understand how they can define each other.
'only a possibility' is the wordplay.
'possibility' is an anagram indicator (another possible arrangement of the letters).
'only'+'a'='onlya'
'onlya' is an anagram of 'LAY ON'.
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" .)