Crossword Genius

Worm is found at foot of a cliff (7)

Ross

I believe the answer is:

ascaris

'worm' is the definition.
(ascaris is a type of worm)

'is found at foot of a cliff' is the wordplay.
'found at foot of' says to put letters next to each other (in a down clue, some letters go below others).
'cliff' becomes 'scar' (I've seen this before).
'a'+'scar'='ascar'
'is' put after 'ascar' is 'ASCARIS'.

I've seen this clue in The Guardian.
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