Strained decimal point (7)
I believe the answer is:
intense
'strained decimal point' is the definition.
The answer and definition are different parts of speech. However, past participle verbs and adjectives sometimes mean the same thing.
'strained decimal point' is the wordplay.
I cannot quite see how this works, but
'strained' could be 'tense' (similar in meaning) and 'tense' is present in the answer.
'point' could be 'n' (N is an example) and 'n' is found in the answer.
A single letter 'i' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for intense that I've seen before include "Feeling deeply" , "Profound" , "'Ardent, forceful (7)'" , "Excited" , "Extremely earnest or serious" .)