Imagining person without face covering pulled back (9)
I believe the answer is:
believing
'imagining' is the definition.
(imagine can mean to believe or assume)
'person without face covering pulled back' is the wordplay.
'person' becomes 'being' (I've seen this in other clues).
'without' is an insertion indicator ('without' can be similar in meaning to 'outside').
'face covering' becomes 'veil' (I've seen this before).
'pulled back' says the letters should be written in reverse.
'veil' backwards is 'liev'.
'being' going around 'liev' is 'BELIEVING'.
(Another definition for believing that I've seen is " Crediting".)