Bishops left US airports I’d left, surprisingly (5,9)
I believe the answer is:
lords spiritual
'bishops' is the definition.
(term for bishops who sit in the House of Lords)
'left us airports i'd left surprisingly' is the wordplay.
'left' becomes 'l' (common abbreviation).
'left' becomes 'l' (common abbreviation).
'surprisingly' is an anagram indicator (a surprising ordering of the letters).
'us'+'airports'+'id'+'l'='usairportsidl'
'usairportsidl' anagrammed gives 'ordsspiritual'.
'l'+'ordsspiritual'='LORDS SPIRITUAL'
(Another definition for lords spiritual that I've seen is " A group of bishops".)