Beware entrance to such underground hollows (5)
I believe the answer is:
caves
'underground hollows' is the definition.
(chambers under the ground)
'beware entrance to such' is the wordplay.
'beware' becomes 'cave' (old-fashioned term meaning 'look out').
'entrance to' indicates taking the first letters.
The initial letter of 'such' is 's'.
'cave'+'s'='CAVES'
(Another definition for caves that I've seen is " Underground chambers".)
I've seen this clue in The Times.
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