Ruler to measure bed that is larger than standard, perhaps (9)

I believe the answer is:

queensize

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

'bed that is larger than standard perhaps' is the definition.
The answer and definition are not the same part of speech.

'ruler to measure' is the wordplay.
'ruler' becomes 'queen' (I've seen this in another clue).
'to measure' becomes 'size' (size is a kind of measure).
'queen'+'size'='QUEENSIZE'

Can you help me to learn more?

I've seen this clue in The Irish Times.

Want a hint initially instead of a full solution? Install my app