Crossword Genius

Support for limb motionless initially in seizure (7)

Ross

I believe the answer is:

armrest

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

'motionless initially in seizure' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'support for limb' is the wordplay.
'support' becomes 'rest' (e.g. a shoulder rest is a support for shoulder).
'for' means one lot of letters go next to another (I've seen this in other clues).
'limb' becomes 'arm' (arm is a kind of limb).
'rest' put after 'arm' is 'ARMREST'.

Can you help me to learn more?

(Other definitions for armrest that I've seen before include "sort of support is needed" , "Part of a chair, perhaps" , "support of chairperson?" , "Part of a chair - smarter (anag)" , "Part of sofa or chair" .)

I've seen this clue in The Times.
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