Carer she involved in fact-finding (8)
I believe the answer is:
research
'fact-finding' is the definition.
(I've seen this before)
'carer she involved' is the wordplay.
'involved' is an anagram indicator (involved can mean confusing or complex).
'carer'+'she'='carershe'
'carershe' anagrammed gives 'RESEARCH'.
'in' is the link.
(Other definitions for research that I've seen before include "Thoroughly investigate" , "Investigation designed to expand knowledge" , "Fact-finding" , "Scientific investigation" , "Investigate through study" .)