Claim pier was engineered and observed (9)
I believe the answer is:
empirical
'observed' is the definition.
(thesaurus)
'claim pier was engineered' is the wordplay.
'claim pier' anagrams to 'EMPIRICAL'.
However, I'm unsure how the anagram is indicated.
'and' acts as a link.
Can you help me to learn more?
(Other definitions for empirical that I've seen before include "Based on experience or experiment" , "Established by experiment" , "Derived from experience" , "Mail price (anag.)" , "Based on observation or experience" .)