Always camping in field, the cheapest way to go (8)
I believe the answer is:
steerage
'cheapest way to go' is the definition.
(cheapest accommodation on a ship)
'always camping in field' is the wordplay.
'always' becomes 'eer' (poetic way of saying ever).
'camping in' indicates putting letters inside (inserted letters shelter or camp in others).
'field' becomes 'stage' (stage can mean a field or area).
'eer' put inside 'stage' is 'STEERAGE'.
'the' is the link.
(Other definitions for steerage that I've seen before include "Cheapest accommodation aboard ship" , "Part of ship with lowest fares" , "Cheap seats" , "Cheapest accommodations on old passenger ships" , "main accommodation" .)