Looking back over Crete's tip, perhaps (13)
I believe the answer is:
retrospective
'looking back' is the definition.
(I've seen this before)
'over crete's tip perhaps' is the wordplay.
'perhaps' is an anagram indicator.
'over'+'cretes'+'tip'='overcretestip'
'overcretestip' with letters rearranged gives 'RETROSPECTIVE'.
(Other definitions for retrospective that I've seen before include "Looking backwards" , "Looking back" .)