Big glare (5)

I believe the answer is:

large

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'big' is the definition.
(I know that big can be written as large)

'glare' is the wordplay.
'glare' anagrams to 'LARGE'.
But, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for large that I've seen before include "Of considerable size or extent" , "Above average in size, number, etc." , "Strapping" , "Chunky" , "jumbo" .)

I've seen this clue in The Irish News.

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