Predicament: torch perhaps stuck under piano (6)
I believe the answer is:
plight
'predicament' is the definition.
(I know that predicament can be written as plight)
'torch perhaps stuck under piano' is the wordplay.
'torch perhaps' becomes 'light' (torch is a kind of light).
'stuck under' is a charade indicator (letters next to each other) (in a down clue, some letters go below others).
'piano' becomes 'p' (musical abbreviation).
'light' after 'p' is 'PLIGHT'.
(Other definitions for plight that I've seen before include "Pledge; predicament" , "Quandary, predicament" , "Unfortunate situation" , "Unlucky situation; promise" , "A serious or difficult situation" .)