Odd number seen to be divided by five (5)
I believe the answer is:
seven
'odd number' is the definition.
'seven' can be an answer for 'number' (seven is a kind of whole number). I am not sure about the 'odd' bit.
'seen to be divided by five' is the wordplay.
'to be divided by' is an insertion indicator (inserted letters divide the word).
'five' becomes 'V' (Roman numeral).
'seen' going around 'v' is 'SEVEN'.
Can you help me to learn more?
(Other definitions for seven that I've seen before include "equivalent of uproar [7D]" , "Number (of stars in the sky?)" , "Film" , "Number of sins, seas or dwarves" , "VII" .)