Hold up trimmed facial hair (4)
I believe the answer is:
bear
'hold up' is the definition.
(I've seen this before)
'trimmed facial hair' is the wordplay.
'trimmed' means to remove the last letter (the final letter is trimmed off).
'facial hair' becomes 'beard' (I've seen this before).
'beard' with its final letter taken off is 'BEAR'.
(Other definitions for bear that I've seen before include "Shoulder - stomach" , "Support; share seller" , "Paddington, Rupert" , "a churlish individual" , "Hack" .)