Short summary about capital investment (5)
I believe the answer is:
recap
'short summary' is the definition.
(I've seen this in another clue)
'about capital investment' is the wordplay.
I cannot quite see how this works, but
'about' could be 're' ('re' means regarding or about) and 're' is found within the answer.
'capital' could be 'cap' (synonyms) and 'cap' is found within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for recap that I've seen before include "Summarise briefly (abbr)" , "Summary (abbr.)" , "Summarising statement" , "Quickly run through" , "Go over old ground" .)