Infiltrate smuggling base after soldiers and I use map and compass (9)

I believe the answer is:
orienteer
'compass' is the definition.
Both the answer and definition are singular nouns.
Perhaps you can see a link between them that I can't see?
'infiltrate smuggling base after soldiers and i use map' is the wordplay.
I cannot really understand how this works, but
'base' could be 'e' (mathematical symbol) and 'e' is located in the answer.
'soldiers' could be 'or' (Other Ranks) and 'or' is found within the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is found within the answer.
'i' is present in the answer.
The remaining letters 'teer' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'and' acts as a link.
Can you help me to learn more?
(Other definitions for orienteer that I've seen before include "Run with aid of map and compass" , "Get my bearings in competition" , "Runner who must find way" , "Cross-country athlete" , "running sport" .)
