She's round and full of energy (5)
I believe the answer is:
olive
'she's' is the definition.
(I've seen this before)
'round and full of energy' is the wordplay.
'round' becomes 'o' (round can mean a round object).
'and' is a charade indicator (letters next to each other).
'full of energy' becomes 'live' (I can't justify this - if you can you should believe this answer much more).
'o'+'live'='OLIVE'
Can you help me to learn more?
(Other definitions for olive that I've seen before include "Type of green" , "Greyish-green; fruit" , "Source of edible oil" , "Fruit; Popeye's girlfriend" , "Yellowy-green colour and fruit" .)