Lager for the boys! (5)

I believe the answer is:

regal

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

'for the boys' is the definition.
I can't judge whether this defines the answer.

'lager' is the wordplay.
'lager' can be anagrammed to 'REGAL'.
Though, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for regal that I've seen before include "'Majestic, royal (5)'" , "Magnificent, dignified" , "Showing great dignity" , "Befitting a monarch" , "Grand and imposing" .)

I've seen this clue in the Evening Standard.

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