First hit for The Boss without a Number 1 - Another Brick in the Wall? (6)
I believe the answer is:
header
'brick in the wall?' is the definition.
'header' can be an answer for 'brick' (header is a kind of brick). I am unsure of the 'in the wall?' bit.
'first hit for the boss without a number 1 another' is the wordplay.
'first hit' becomes 'h' (est letter of 'hit').
'for' is a charade indicator (letters next to each other).
'the boss' becomes 'eder' (I can't explain this - if you can you should give a lot more credence to this answer).
'without' indicates putting letters inside ('without' can be similar in meaning to 'outside').
'a number e another' becomes 'a' (est letter of 'another').
'eder' enclosing 'a' is 'eader'.
'h'+'eader'='HEADER'
Can you help me to learn more?
(Other definitions for header that I've seen before include "One way to get a goal in football" , "Type of dive" , "Adhere (anag) - part of an email" , "A soccer pass; a laid brick" , "Line at top of each page of a document" .)