Almost all the time in Britain, yes? This isn’t (6,3)

I believe the answer is:

galway bay

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'isn't' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'almost all the time in britain yes?' is the wordplay.
'almost all the time' becomes 'alway' (I am not sure about this - if you are sure you should believe this answer much more).
'in' means one lot of letters goes inside another.
'britain' becomes 'GB' (abbreviation for Great Britain).
'yes?' becomes 'ay'.
'alway' going inside 'gb' is 'galwayb'.
'galwayb'+'ay'='GALWAY BAY'

'this' acts as a link.

Can you help me to learn more?

(Other definitions for galway bay that I've seen before include "Song" , "Large inlet of W. Eire" .)

I've seen this clue in The Times.

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