Chap I included in account that's potentially powerful (6)
I believe the answer is:
atomic
'potentially powerful' is the definition.
I can't judge whether this defines the answer.
'chap i included in account' is the wordplay.
'chap' becomes 'tom' (a man's name).
'included in' means one lot of letters goes inside another.
'account' becomes 'ac' (abbreviation for account).
'tom'+'i'='tomi'
'tomi' going within 'ac' is 'ATOMIC'.
'that's' is the link.
Can you help me to learn more?
(Other definitions for atomic that I've seen before include "Extremely minute" , "Employing nuclear energy" , "Sort of energy or number" , "Relating to nuclear fission" , "Relating to basic particles" .)