Conjure up memories about short skirts at church (9)
I believe the answer is:
reminisce
'conjure up memories' is the definition.
(to reminisce is to recall memories)
'about short skirts at church' is the wordplay.
'about' becomes 're' ('re' means regarding or about).
'short skirts' becomes 'minis' (mini skirts).
'at' is a charade indicator (letters next to each other).
'church' becomes 'CE' (abbreviation for Church of England).
're'+'minis'+'ce'='REMINISCE'
(Other definitions for reminisce that I've seen before include "Remember past" , "Recollect past events" , "Recount memories" , "talk about the old days" , "Indulge in recollection" .)