Sees great possibility in Roman exploits (3,6)

I believe the answer is:

res gestae

'roman exploits' is the definition.
(Latin term for exploits or acts)

'sees great possibility' is the wordplay.
'possibility' is an anagram indicator (another possible arrangement of the letters).
'sees'+'great'='seesgreat'
'seesgreat' is an anagram of 'RES GESTAE'.

'in' is the link.

I've seen this clue in The Guardian.

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