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Has very little energy for seven days, we're told (4)

Ross

I believe the answer is:

weak

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

'has very little energy' is the definition.
I can't judge whether this defines the answer.

'seven days we're told' is the wordplay.
'seven days' becomes 'week' (I've seen this in another clue).
'we're told' indicates a 'sounds like' (homophone) clue.
'week' sounds like 'WEAK'.

'for' is the link.

Can you help me to learn more?

(Other definitions for weak that I've seen before include "Undefended" , "Feeble or frail" , "Puny" , "Faint; frail" , "Wanting in physical strength" .)

I've seen this clue in The Irish Times.
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