Spillage of paint not appropriate (5)

I believe the answer is:

inapt

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'not appropriate' is the definition.
(inapt means inappropriate or ill-fitting)

'spillage of paint' is the wordplay.
'paint' anagrams to 'INAPT'.
However, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for inapt that I've seen before include "It's clumsy" , "not fit for purpose" , "Not fit, unsuitable" , "Cartoon duck" , "Free from deceit" .)

I've seen this clue in The Times.

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