Eddy, Victor or Tony’s first old flame (6)
I believe the answer is:
vortex
'eddy' is the definition.
(I've seen this before)
'victor or tony's first old flame' is the wordplay.
'victor' becomes 'V' (phonetic alphabet: alpha, bravo, charlie etc.).
'tony's first' becomes 't' (1st letter of 'tony').
'old flame' becomes 'ex' (an ex-lover).
'v'+'or'+'t'+'ex'='VORTEX'
(Other definitions for vortex that I've seen before include "Eddy" , "Revolutionary movement" , "Whirlpool - whirlwind" , "Whirling mass of water or air" , "Whirling fluid" .)