Show clearly Eastern Church storing French wine (6)
I believe the answer is:
evince
'show clearly' is the definition.
(I've seen this before)
'eastern church storing french wine' is the wordplay.
'eastern' becomes 'e'.
'church' becomes 'ce' (abbreviation for Church of England).
'storing' indicates putting letters inside.
'french wine' becomes 'vin' (I've seen this before).
'e'+'ce'='ece'
'ece' placed around 'vin' is 'EVINCE'.
(Other definitions for evince that I've seen before include "Indicate, show clearly" , "Indicate (something)" , "Show or display clearly" , "Express,show" , "Express, show" .)