Crossword Genius

Make available only a possibility (3,2)

Ross

I believe the answer is:

lay on

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'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" .)

I've seen this clue in the Evening Standard.
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