A form of tablet for assistance (7)

I believe the answer is:

abettal

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'assistance' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's an association between them I don't understand?

'a form of tablet' is the wordplay.
'form of' is an anagram indicator (the letters need to be in another 'form').
'tablet' with letters rearranged gives 'bettal'.
'a'+'bettal'='ABETTAL'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for abettal that I've seen before include "dubious help" , "Encouragement" , "in aid of crime" .)

I've seen this clue in The Telegraph.

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