Crossword Genius

Young creature to leap explosively across delta (7)

Ross

I believe the answer is:

tadpole

'young creature' is the definition.

'to leap explosively across delta' is the wordplay.
'explosively' indicates an anagram.
'across' is an insertion indicator.
'delta' becomes 'd' (phonetic alphabet: alpha, bravo, charlie etc.).
'to'+'leap'='toleap'
'toleap' anagrammed gives 'tapole'.
'tapole' placed around 'd' is 'TADPOLE'.

(Other definitions for tadpole that I've seen before include "wriggler?" , "Amphibian larva" , "immature sea squirt" , "frog may spring from" , "young swimmer" .)

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