One to blend in drink with energy-packed fruit (9)
I believe the answer is:
chameleon
'one to blend in' is the definition.
(I've seen this before)
'drink with energy-packed fruit' is the wordplay.
I cannot really see how this works, but
'drink' could be 'cha' (cha can mean tea) and 'cha' is found in the answer.
'energy' could be 'e' (physics symbol as in E=mc2) and 'e' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for chameleon that I've seen before include "Self-camouflaging lizard" , "Lizard hard to spot" , "Colour-changing lizard" , "Lizard that can change colour to match surroundings" , "Ha! Clone me (anag)" .)