Crossword Genius

Jelly for crawler in charge (5)

Ross

I believe the answer is:

aspic

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'jelly' is the definition.
(I know that aspic is a type of jelly)

'crawler in charge' is the wordplay.
'crawler' becomes 'asp' (I can't explain this - if you can you should believe this answer much more).
'in charge' becomes 'ic' (abbreviation for 'in charge').
'asp'+'ic'='ASPIC'

'for' is the link.

Can you help me to learn more?

(Other definitions for aspic that I've seen before include "Savoury relish" , "Stock set with food" , "Clear savoury jelly" , "Setter" , "Savoury jelly for meat or vegetable" .)

I've seen this clue in The Daily Express.
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