Atrica could go either way about using feet (6)
I believe the answer is:
iambic
'feet' is the definition.
(I've seen this before)
'atrica could go either way about' is the wordplay.
'atrica' becomes 'I' (where the crossword setter is 'Atrica').
'could go either way' becomes 'ambi' (I can't explain this - if you can you should give a lot more credence to this answer).
'about' becomes 'c' (circa).
'i'+'ambi'+'c'='IAMBIC'
'using' acts as a link.
Can you help me to learn more?
(Other definitions for iambic that I've seen before include "Kind of metric foot in poetry" , "In ti-tum rhythm" , "Type of verse" , "regularly stressed" , "Of a metrical foot of two syllables, one short and one long" .)