Somehow cleverest hens not caught yet (12)
I believe the answer is:
nevertheless
'yet' is the definition.
(I know that yet can be written as nevertheless)
'somehow cleverest hens not caught' is the wordplay.
'somehow' is an anagram indicator.
'not' indicates named letters should be taken away.
'caught' becomes 'c' (cricket abbreviation).
'cleverest'+'hens'='cleveresthens'
'cleveresthens' with 'c' removed is 'leveresthens'.
'leveresthens' with letters rearranged gives 'NEVERTHELESS'.
(Other definitions for nevertheless that I've seen before include "anyhow" , "But always" , "Still" , "However" , "Notwithstanding" .)