Strangely, no US gaol area is comparable (9)
I believe the answer is:
analogous
'comparable' is the definition.
(I've seen this before)
'strangely no us gaol area' is the wordplay.
'strangely' is an anagram indicator.
'area' becomes 'a' (maths abbreviation).
'no'+'us'+'gaol'+'a'='nousgaola'
'nousgaola' anagrammed gives 'ANALOGOUS'.
'is' acts as a link.
(Other definitions for analogous that I've seen before include "show correspondence" , "Eg, mastic" , "similar" , "corresponding" , "Comparable in certain respects" .)