“Head for Munich”, German saying (5)
I believe the answer is:
motto
'saying' is the definition.
(I know that saying can be written as motto)
'head for munich german' is the wordplay.
'head for' suggests taking the first letters.
'german' becomes 'otto' (I've seen this before).
The first letter of 'munich' is 'm'.
'm'+'otto'='MOTTO'
(Other definitions for motto that I've seen before include "Phrase in a Christmas cracker" , "Repeated theme in music" , "Words often found on coat of arms" , "Saying in a cracker" , "Part of coat of arms" .)