Goods are offered for it (4)
I believe the answer is:
sale
'goods are' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'for it' is the wordplay.
'for' becomes 'sal' (I can't justify this - if you can you should believe this answer much more).
'it' becomes 'e' ('e' can mean 'electronic' which is similar to 'IT').
'sal'+'e'='SALE'
'offered' acts as a link.
Can you help me to learn more?
(Other definitions for sale that I've seen before include "Bargain-price event" , "See 12 Down" , "Transaction" , "Offer period" , "Period of low prices" .)