See Roman south of river making investigation (5)

I believe the answer is:

recce

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'investigation' is the definition.
(I've seen this before)

'see roman south of river' is the wordplay.
'see roman' becomes 'ecce' (I am not sure about this - if you are sure you should believe this answer much more).
'south of' means one lot of letters go next to another.
'river' becomes 'r'.
'ecce' put after 'r' is 'RECCE'.

'making' acts as a link.

Can you help me to learn more?

(Other definitions for recce that I've seen before include "Exploratory foray (mil. colloq.)" , "Shufti" , "Explore with the aim of gaining useful information" , "Advance exploration" , "Scout" .)

I've seen this clue in The Times.

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