Crossword Genius

Seaport’s redevelopment not needed (2,5)

Ross

I believe the answer is:

to spare

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'seaport's redevelopment not needed' is the definition.
I can't judge whether this defines the answer.

'seaport's redevelopment' is the wordplay.
'redevelopment' is an anagram indicator.
'seaport' with letters rearranged gives 'TO SPARE'.

Can you help me to learn more?

(Another definition for to spare that I've seen is " Left over".)

I've seen this clue in The Times.
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