Stripped, dive deeper at sea using half the energy (8)
I believe the answer is:
deprived
'stripped' is the definition.
('deprive' can be a synonym of 'strip')
'dive deeper at sea using half the energy' is the wordplay.
I cannot quite see how this works, but
an anagram of 'dive' is 'ived' which is located in the answer.
'energy' could be 'e' (physics symbol as in E=mc2) and 'e' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for deprived that I've seen before include "Dispossessed; suffering hardship" , "Underprivileged, needy" , "Impoverished" , "Prevented from using or enjoying something" , "Dispossessed (of something)" .)