Support Times on position trader takes on market (5,2)

I believe the answer is:
stand by
'support' is the definition.
(I've seen this before)
'times on position trader takes on market' is the wordplay.
I cannot really understand how this works, but
'times' could be 'by' (both can mean 'multiplied by') and 'by' is found within the answer.
'position' could be 'stand' (stand is a kind of position) and 'stand' is found in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for stand by that I've seen before include "the kind of passenger that may not get on with others" , "person ready to step into the breach" , "One ready for emergency duty" , "Item or person ready for use in emergency" , "Remain loyal to" .)
