Can frequently sell for five cents in the US (6)
I believe the answer is:
nickel
'five cents in the us' is the definition.
(I've seen this before)
'can frequently sell' is the wordplay.
'can' becomes 'nick' (I can't explain this - if you can you should give a lot more credence to this answer).
'frequently' means one should take alternating letters (letters selected at a regular frequency).
The alternate letters of 'sell' are 'el'.
'nick'+'el'='NICKEL'
'for' is the link.
Can you help me to learn more?
(Other definitions for nickel that I've seen before include "very little money" , "American 5-cent piece" , "A 5-cent coin in USA" , "One twentieth of a US dollar" , "Metal - 5 cents" .)