Wall I'd built in which hole found, struck down (4,3)
I believe the answer is:
laid low
'struck down' is the definition.
'laid low' can be an answer for 'down' (thesaurus). I am not certain of the 'struck' bit.
'wall i'd built in which hole' is the wordplay.
'built' is an anagram indicator (the same letters can be used to build the answer).
'in which' indicates putting letters inside.
'hole' becomes 'O'.
'wall'+'id'='wallid'
'wallid' is an anagram of 'laidlw'.
'laidlw' going around 'o' is 'LAID LOW'.
'found' is the link.
Can you help me to learn more?
(Other definitions for laid low that I've seen before include "Hid away" , "Stricken" , "Felled" , "Put out of action by illness" , "Brought down" .)