Produce only when a Beatle enters (5,3)

I believe the answer is:

bring out

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'produce' is the definition.
(synonyms)

'only when a beatle enters' is the wordplay.
'only when' becomes 'but' (I can't justify this - if you can you should believe this answer much more).
'a beatle' becomes 'ringo' (I've seen this before).
'enters' is an insertion indicator.
'but' placed around 'ringo' is 'BRING OUT'.

Can you help me to learn more?

(Other definitions for bring out that I've seen before include "Publish" , "Emphasise" , "Elicit" , "Issue" , "Emphasize (a feature)" .)

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