Sticky spot for a general manager in paper combine (8)

I believe the answer is:

quagmire

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'sticky spot' is the definition.
'quagmire' can be an answer for 'spot' (thesaurus). I'm not certain of the 'sticky' bit.

'a general manager in paper combine' is the wordplay.
'general manager' becomes 'GM' (abbreviation).
'in' means one lot of letters goes inside another.
'paper combine' becomes 'quire' (I can't explain this - if you can you should believe this answer much more).
'a'+'gm'='agm'
'agm' going within 'quire' is 'QUAGMIRE'.

'for' is the link.

Can you help me to learn more?

(Other definitions for quagmire that I've seen before include "Bog - awkward situation" , "Here one is bogged down" , "You can get bogged down in this" , "Boggy ground" , "Bog or marsh" .)

I've seen this clue in The Globe and Mail.

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