Bowler's appeal: first wicket! (I've forgotten the name) (7)
I believe the answer is:
whatsit
'i've forgotten the name' is the definition.
(said when you've forgotten a word)
'bowler's appeal first wicket' is the wordplay.
'bowler's' becomes 'hats' (bowler is a type of hat).
'appeal' becomes 'it' ('it' can mean something attractive or appealing).
'first' says to put letters next to each other.
'wicket' becomes 'w'.
'hats'+'it'='hatsit'
'hatsit' after 'w' is 'WHATSIT'.
(Other definitions for whatsit that I've seen before include "Thingumajig" , "Something one can't recall" , "person not to be named" , "Thingummy" , "something indefinable" .)