Light and fashionable, the cooking vessel is an instant hit (5,2,3,3)
I believe the answer is:
flash in the pan
'an instant hit' is the definition.
'flash in the pan' can be an answer for 'hit' (thesaurus). I am unsure of the 'an instant' bit.
'light and fashionable the cooking vessel' is the wordplay.
'light' becomes 'flash' (flash is a kind of light).
'and' is a charade indicator (letters next to each other).
'fashionable' becomes 'in' (similar in meaning).
'cooking vessel' becomes 'pan' (I've seen this before).
'flash'+'in'+'the'+'pan'='FLASH IN THE PAN'
'is' is the link.
Can you help me to learn more?
(Other definitions for flash in the pan that I've seen before include "Brief success - flambe moment?" , "One-off success" , "Nine days' wonder" , "briefly successful thing" , "Failure, after initial promise" .)