Crossword Genius

Cohabiters make dull friends (9)

Ross

I believe the answer is:

flatmates

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

'cohabiters' is the definition.
I can't judge whether this defines the answer.

'dull friends' is the wordplay.
'dull' becomes 'flat' (similar in meaning).
'friends' becomes 'mates' (mate is a kind of friend).
'flat'+'mates'='FLATMATES'

'make' is the link.

Can you help me to learn more?

(Another definition for flatmates that I've seen is " Home sharers".)

I've seen this clue in The Mirror.
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