Pack to take to market in Suffolk (4)
I believe the answer is:
stow
'pack' is the definition.
(stowing is a kind of packing)
'to take to market in suffolk' is the wordplay.
'to take' means one lot of letters goes inside another (inserted letters are taken in).
'market in suffolk' becomes 'sw' (I can't justify this - if you can you should give a lot more credence to this answer).
'to' placed into 'sw' is 'STOW'.
Can you help me to learn more?
(Other definitions for stow that I've seen before include "Put under the hatches" , "Put tidily away" , "Lay up, pack away" , "- - -on-the-Wold" , "Pack (object) away" .)