Open pastry dish empty on stove (5)
I believe the answer is:
agape
'open' is the definition.
('agape' can be similar in meaning to 'open')
'pastry dish empty on stove' is the wordplay.
'pastry dish' becomes 'pie' (I've seen this before).
'empty' suggests removing the centre.
'on' is a charade indicator (letters next to each other).
'stove' becomes 'aga' (I've seen this before).
'pie' with its middle removed is 'pe'.
'pe' put after 'aga' is 'AGAPE'.
(Other definitions for agape that I've seen before include "(Of mouth) wide open" , "Christian's love" , "love a Christian shows" , "showing disbelief" , "Christian feast" .)