King Edward, possibly, digesting poem about a crawler (9)

I believe the answer is:

toadeater

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'crawler' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see an association between them that I can't see?

'king edward possibly digesting poem about a' is the wordplay.
'king edward possibly' becomes 'tater' (King Edward is a type of potato).
'digesting' is an insertion indicator (inserted letters are eaten or ingested).
'poem' becomes 'ode' (ode is a type of poem).
'about' is an insertion indicator.
'tater' going around 'ode' is 'todeater'.
'todeater' placed around 'a' is 'TOADEATER'.

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I've seen this clue in The Times.

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