No more stars for nightwatchmen (11)

I believe the answer is:

astronomers

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

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

'no more stars' is the wordplay.
'no more stars' anagrams to 'ASTRONOMERS'.
But, I'm not sure how the anagram is indicated.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for astronomers that I've seen before include "Moon-starers (anag)" , "Monster oars (anag.)" .)

I've seen this clue in The Globe and Mail.

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