Crossword Genius

Crazier to plunge over jetty (7)

Ross

I believe the answer is:

dippier

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'crazier' is the definition.
Both the answer and definition are comparative adjectives.
Perhaps they are linked in a way I don't understand?

'plunge over jetty' is the wordplay.
'plunge' becomes 'dip' (synonyms).
'over' means one lot of letters go next to another.
'jetty' becomes 'pier' (I've seen this before).
'dip'+'pier'='DIPPIER'

'to' acts as a link.

Can you help me to learn more?

(Other definitions for dippier that I've seen before include "Relatively crazy" , "comparatively silly" .)

I've seen this clue in The Hindu.
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