Land and labour required for a foundation (10)
I believe the answer is:
groundwork
'for a foundation' is the definition.
(synonyms)
'land and labour' is the wordplay.
'land' becomes 'ground' (synonyms).
'and' means one lot of letters go next to another.
'labour' becomes 'work' (I've seen this before).
'ground'+'work'='GROUNDWORK'
'required' acts as a link.
(Other definitions for groundwork that I've seen before include "Preliminary effort" , "Preparations" .)