Accommodation suitable for a squarely built boy? (8)

I believe the answer is:

cubicles

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'accommodation suitable' is the definition.
I can't tell whether this defines the answer.

'squarely built boy?' is the wordplay.
'squarely built' becomes 'cubic' (I am not sure about this - if you are sure you should believe this answer much more).
'boy?' becomes 'les' (short for Leslie).
'cubic'+'les'='CUBICLES'

'for a' acts as a link.

Can you help me to learn more?

(Other definitions for cubicles that I've seen before include "Small divisions of large room" , "Places to change at swimming pool" .)

I've seen this clue in the Evening Standard.

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