Crossword Genius

Strange hold-up in river delta (5)

Ross

I believe the answer is:

weird

'strange' is the definition.
(synonyms)

'hold-up in river delta' is the wordplay.
'hold-up in river' becomes 'weir' (weir is a type of river dam).
'delta' becomes 'd' (phonetic alphabet: alpha, bravo, charlie etc.).
'weir'+'d'='WEIRD'

(Other definitions for weird that I've seen before include "Creepy" , "Unearthly" , "Uncanny, bizarre" , "Eerie, odd" , "behaving erratically?" .)

I've seen this clue in The Times.
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