Decimal point indeed great (7)
I believe the answer is:
intense
'great' is the definition.
(I've seen this before)
'decimal point indeed' is the wordplay.
I cannot really understand how this works, but
'point' could be 'se' (SE is an example) and 'se' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for intense that I've seen before include "Vivid, concentrated" , "Powerful" , "Vived, extreme, acute" , "Deeply felt - extreme" , "In an extreme degree" .)