Crossword Genius

Bottom of cooling tower is dark (5)

Ross

I believe the answer is:

gloom

'is dark' is the definition.
(I've seen this before)

'bottom of cooling tower' is the wordplay.
'bottom of' suggests the final letters.
'tower' becomes 'loom' ('loom' can be a synonym of 'tower'**).
The last letter of 'cooling' is 'g'.
'g'+'loom'='GLOOM'

(Other definitions for gloom that I've seen before include "Darkness; depression" , "Obscurity or melancholy" , "Depression and melancholy" , "Betting figures" , "Murk" .)

I've seen this clue in The Sun and The Independent.
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