Crossword Genius

Lock in colleague's support for retired people (10)

Ross

I believe the answer is:

mattresses

'support for retired people' is the definition.
(support for people who have gone to bed ie retired)

'lock in colleague's' is the wordplay.
'lock' becomes 'tress' (I've seen this before).
'in' means one lot of letters goes inside another.
'colleague's' becomes 'mates'.
'tress' placed into 'mates' is 'MATTRESSES'.

(Another definition for mattresses that I've seen is " Items often stuffed with foam rubber".)

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