King seen before Lent, possibly, prepared to pray? (5)
I believe the answer is:
knelt
'prepared to pray?' is the definition.
(I've seen this in another clue)
'king seen before lent possibly' is the wordplay.
'king' becomes 'K' (abbreviation for king in chess).
'seen before' is a charade indicator (letters next to each other).
'possibly' indicates anagramming the letters.
'lent' is an anagram of 'nelt'.
'k'+'nelt'='KNELT'
(Other definitions for knelt that I've seen before include "Used hassock maybe" , "Rested on a bent leg" , "Rested on the knees" , "Prepared to pray?" , "Genuflected" .)