Mayan peeled onion sent over for religious leaders (10)

'religious leaders' is the definition.
(I've seen this before)

'mayan peeled onion sent over' is the wordplay.
'peeled' means to look at the middle letters.
'onion' becomes 'shallot' (shallot is a kind of onion).
'sent over' is a reversal indicator.
The middle of 'mayan' is 'aya'.
'shallot' back-to-front is 'tollahs'.
'aya'+'tollahs'='AYATOLLAHS'

'for' acts as a link.