Crossword Genius

Suffer from insufficient energy? (7)

Ross

I believe the answer is:

undergo

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'suffer' is the definition.
(I know that suffer is a more specific form of experience)

'insufficient energy?' is the wordplay.
'insufficient' becomes 'under' (I can't explain this - if you can you should believe this answer much more).
'energy?' becomes 'go' (go can mean energy or enthusiasm).
'under'+'go'='UNDERGO'

'from' is the link.

Can you help me to learn more?

(Other definitions for undergo that I've seen before include "put up with" , "having to travel by tube" , "Endure or be subjected to" , "Guerdon (anag.)" , "Suffer reverse" .)

I've seen this clue in The Independent.
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