Orange feature of time signal (3,4)
I believe the answer is:
the pips
'orange feature of time signal' is the definition.
I can't judge whether this definition defines the answer.
'of time signal' is the wordplay.
I cannot really understand how this works, but
'time' could be 't' (abbreviation) and 't' is present in the answer.
'signal' could be 'pi' (pi is a kind of signal) and 'pi' is present in the answer.
The remaining letters 'heps' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for the pips that I've seen is " broadcast for an hour".)