Explain cryptic clue, I see (9)
I believe the answer is:
elucidate
'explain' is the definition.
(I know that elucidate is a more specific form of explain)
'cryptic clue? i see' is the wordplay.
'cryptic' is an anagram indicator (a cryptic or obscure order of the letters).
'see' becomes 'date' (synonyms).
'clue' with letters rearranged gives 'eluc'.
'eluc'+'i'+'date'='ELUCIDATE'
(Other definitions for elucidate that I've seen before include "Make clear and more comprehensible" , "Make clear, explain" , "Shed light upon" , "Shed light on, clarify" , "Throw light on a problem, make clear (9)" .)