Try containing some French footie manoeuvre (6)
I believe the answer is:
header
'footie manoeuvre' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'try containing some french' is the wordplay.
'try' becomes 'hear' (as in to try someone in court or hear their case).
'containing' is an insertion indicator.
'some french' becomes 'de' ('some' in French).
'hear' enclosing 'de' is 'HEADER'.
Can you help me to learn more?
(Other definitions for header that I've seen before include "Type of dive" , "A soccer pass; a laid brick" , "One way to get a goal in football" , "Line at top of each page of a document" , "Text at top of page" .)