Crossword Genius

Clinging on to plaice finally, angler is disposed to do this? (7)

Ross

I believe the answer is:

enlarge

I'm a little stuck... Click here to teach me more about this clue!

'clinging on to plaice finally' is the definition.
I can't tell whether this definition defines the answer.

'angler is disposed to do this?' is the wordplay.
I cannot really see how this works, but
an anagram of 'angler' is 'enlarg' which is within the answer.
A single letter 'e' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for enlarge that I've seen before include "General (anag)" , "go into greater detail" , "Make big" , "Dilate" , "Make bigger in general" .)

I've seen this clue in The Telegraph.
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