Old scorer (as Peter Crouch is) (6)
I believe the answer is:
tallis
'old scorer' is the definition.
'tallis' can be an answer for 'scorer' (choral composer Thomas Tallis). I'm not sure about the 'old' bit.
'peter crouch is' is the wordplay.
'peter crouch' becomes 'tall' (I can't justify this - if you can you should believe this answer much more).
'tall'+'is'='TALLIS'
'as' acts as a link.
Can you help me to learn more?
(Other definitions for tallis that I've seen before include "Premier English composer at the court of Henry VIII" , "Thomas -, sixteenth century English composer" , "Thomas --, Elizabethan composer" , "Writer of stuff for royalty" , "Thomas ---, Tudor composer" .)