Energy-filled writer is bit of a tool (4)
I believe the answer is:
peen
'bit of a tool' is the definition.
The definition suggests a singular noun which matches the answer.
'energy-filled writer' is the wordplay.
'energy' becomes 'e' (physics symbol as in E=mc2).
'filled' means one lot of letters goes inside another.
'writer' becomes 'pen' (something which writes).
'e' placed within 'pen' is 'PEEN'.
'is' is the link.
Can you help me to learn more?
I've seen this clue in The Independent.
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