Left a gratuity for priest consumed by dangerous diet (6)
I believe the answer is:
tipped
'left a gratuity' is the definition.
(I've seen this in another clue)
'priest consumed by dangerous diet' is the wordplay.
'priest' becomes 'pp' (I've seen this in other clues).
'consumed by' is an insertion indicator (inserted letters get consumed).
'dangerous diet' becomes 'tied' (I can't explain this - if you can you should give a lot more credence to this answer).
'pp' inserted into 'tied' is 'TIPPED'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for tipped that I've seen before include "Gave reward (to waiter)" , "Crowned" , "Predicted to be a winner" , "Given a gratuity" , "Gave gratuity to or touched" .)