He's starved, you suspect — feast approaching fast (6,7)

I believe the answer is:

shrove tuesday

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'feast approaching fast' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'he's starved you suspect' is the wordplay.
'suspect' is an anagram indicator (a suspicious or unusual spelling).
'hes'+'starved'+'you'='hesstarvedyou'
'hesstarvedyou' is an anagram of 'SHROVE TUESDAY'.

Can you help me to learn more?

(Other definitions for shrove tuesday that I've seen before include "Pre-Lent feast day" , "Pancake Day" .)

I've seen this clue in The Guardian.

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