No motivation when chemise is off? (9)

I believe the answer is:

shiftless

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'no motivation when' is the definition.
I can't judge whether this defines the answer.

'chemise is off?' is the wordplay.
'chemise' becomes 'shift' (synonyms).
'is off?' becomes 'less' (I've seen this in another clue).
'shift'+'less'='SHIFTLESS'

Can you help me to learn more?

(Other definitions for shiftless that I've seen before include "Idle" , "Like an automatic American car" , "Lazy - indolent" , "lacking in initiative" .)

I've seen this clue in The Daily Express.

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