Being mature helps you to cool down! (3)

I believe the answer is:

old

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

'being mature' is the definition.
('old' is associated in meaning with 'mature')

'helps you to cool down' is the wordplay.
'OLD' is hidden within the letters.
However, I'm unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for old that I've seen before include "No longer young" , "Wild clematis" , "Getting on" , "Much-used" , "Vintage" .)

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