Crossword Genius

Squad, underpowered, needing boost to energy? (4)

Ross

I believe the answer is:

team

I'm a little stuck... Click here to teach me more about this clue!

'squad' is the definition.
(I know that squad can be written as Team)

'underpowered needing boost to energy?' is the wordplay.
I cannot really understand how this works, but
'energy?' could be 'e' (physics symbol as in E=mc2) and 'e' is present in the answer.
The remaining letters 'tam' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for team that I've seen before include "Squad; side" , "Group working in combination" , "People working together" , "A set of players or workers" , "(Football) side" .)

I've seen this clue in The Independent.
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