Leading American male’s going to cycle from Germany (8)
I believe the answer is:
ushering
'leading' is the definition.
(ushering is a kind of leading)
'american male's going to cycle from germany' is the wordplay.
'american' becomes 'US' (United States).
'male' becomes 'he' (he refers to a man).
'going to' means one lot of letters go next to another.
'cycle from germany' becomes 'ring' (I can't explain this - if you can you should give a lot more credence to this answer).
'us'+'he'+'ring'='USHERING'
Can you help me to learn more?
(Other definitions for ushering that I've seen before include "Showing people to their seats" , "putting one in one's place" , "Taking people to their seats" , "working as escorts" , "Showing to a seat" .)