Went inside to plumb a godforsaken leaky radiator and got back pain (7)

I believe the answer is:

lumbago

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

'back pain' is the definition.
(I've seen this before)

'went inside to plumb a godforsaken leaky radiator and' is the wordplay.
'LUMBAGO' is hidden within the letters.
But, I am uncertain how the hidden word is indicated.

'got' acts as a link.

Can you help me to learn more?

(Other definitions for lumbago that I've seen before include "Pain -- a bum log (anag)" , "Back complaint" , "Form of backache" , "Lower back ache" , "Rheumatic backache" .)

I've seen this clue in The Irish Times.

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