Bungle an attempt to get wages increased (5,2)

I believe the answer is:

screw up

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'bungle an attempt' is the definition.
'screw up' can be an answer for 'bungle' (synonyms). I'm not certain of the 'an attempt' bit.

'get wages increased' is the wordplay.
'get' is a charade indicator (letters next to each other).
'wages' becomes 'screw' (I've seen this before).
'increased' becomes 'up' (something that's up has increased or risen).
'screw' next to 'up' is 'SCREW-UP'.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for screw up that I've seen before include "Completely mismanage a situation" , "Ineptly fail" , "Get it badly wrong" , "Completely mismanage (colloq.)" , "Bungle" .)

I've seen this clue in the Evening Standard.

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