Reach church that is in avenue (7)
I believe the answer is:
achieve
'reach' is the definition.
(synonyms)
'church that is in avenue' is the wordplay.
'church' becomes 'ch' (common abbreviation).
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
'in' indicates putting letters inside.
'avenue' becomes 'ave'.
'ch'+'ie'='chie'
'chie' put into 'ave' is 'ACHIEVE'.
(Other definitions for achieve that I've seen before include "Attain successfully" , "Produce" , "Accomplish, gain by effort" , "Effect" , "Bring about by effort" .)