Crossword Genius

Surge that's bound to be heard (4)

Ross

I believe the answer is:

tide

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

'bound to be heard' is the wordplay.
'bound' becomes 'tied' (I've seen this before).
'to be heard' indicates a 'sounds like' (homophone) clue.
'tied' sounds like 'TIDE'.

'that's' is the link.

(Other definitions for tide that I've seen before include "(With time) it waits for no man" , "In the main, movement" , "Rising and falling of the sea" , "Periodic water movement" , "Periodic flow" .)

I've seen this clue in The Telegraph.
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