It hinders progress when I'm breaking a record (4)

I believe the answer is:

limp

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'it hinders progress' is the definition.
The definition suggests a singular noun which matches the answer.

'i'm breaking a record' is the wordplay.
'i'm' becomes 'im' ().
'breaking' indicates putting letters inside.
'a record' becomes 'L-P' (abbreviation for long play record).
'im' inserted inside 'lp' is 'LIMP'.

'when' is the link.

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(Other definitions for limp that I've seen before include "Walk with an injury" , "Hanging loosely - hobble" , "Walk haltingly" , "Saggy and drooping" , "without energy" .)

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

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