A musical time for gunners at Gateshead (3)

I believe the answer is:

rag

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'a musical time' is the definition.
'rag' can be an answer for 'time' (thesaurus). I'm not sure about the 'a musical' bit.

'gunners at gateshead' is the wordplay.
'gunners' becomes 'ra' (Royal Artillery).
'at' is a charade indicator (letters next to each other).
'gateshead' becomes 'g' (head letter of 'gates').
'ra'+'g'='RAG'

'for' is the link.

Can you help me to learn more?

(Other definitions for rag that I've seen before include "played by Scott Joplin?" , "Bit of material" , "Take the mickey out of" , "Cloth; bait" , "charity event" .)

I've seen this clue in the Evening Standard.

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