Crossword Genius

No more stars for night watchmen (11)

Ross

I believe the answer is:

astronomers

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

'night watchmen' is the definition.
The answer and definition can be both people as well as being plural nouns.
Maybe there's an association between them I don't understand?

'no more stars' is the wordplay.
'no more stars' anagrams to 'ASTRONOMERS'.
However, I am not clear 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 "Monster oars (anag.)" , "Moon-starers (anag)" .)

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