Crossword Genius

Having an inclination to be angular? (4)

Ross

I believe the answer is:

lean

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

'angular?' is the definition.
(I've seen this in another clue)

'having an inclination' is the wordplay.
I cannot quite understand how this works, but
'an' could be 'a' and 'a' is located in the answer.
The remaining letters 'len' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'to be' is the link.

Can you help me to learn more?

(Other definitions for lean that I've seen before include "Current update (colloq.)" , "The fatless part of the meat" , "Thin; heel" , "Inclination" , "Of meat, with little or no fat" .)

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