Page gets frivolous in a predicament (6)
I believe the answer is:
plight
'predicament' is the definition.
(I know that predicament can be written as plight)
'page gets frivolous' is the wordplay.
'page' becomes 'p'.
'gets' means one lot of letters go next to another.
'frivolous' becomes 'light' (light can mean trivial or unimportant).
'p'+'light'='PLIGHT'
'in a' acts as a link.
(Other definitions for plight that I've seen before include "Quandary, predicament" , "Alarming predicament" , "Unfortunate situation" , "Pledge; predicament" , "Unlucky situation; promise" .)