Spike: I could do with some sun (6)

I believe the answer is:

impale

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'spike' is the definition.
(synonyms)

I cannot understand how the remainder of the clue works.

(Other definitions for impale that I've seen before include "go through with it" , "Pierce with pointed stick" , "Fix as on a sharp stick" , "Pierce through as with sharp stick" , "kebab" .)

I've seen this clue in The Sun.

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