Detailed army unit diet programme (7)
I believe the answer is:
regimen
'diet programme' is the definition.
'regimen' can be an answer for 'programme' (regimen is a kind of programme). I am unsure of the 'diet' bit.
'detailed army unit' is the wordplay.
'detailed' means to remove the last letter (the word must be end-less or 'de-tailed').
'army unit' becomes 'regiment' (regiment is a kind of army unit).
'regiment' with its final letter taken away is 'REGIMEN'.
Can you help me to learn more?
(Other definitions for regimen that I've seen before include "Merge in (anag.)" , "(In medicine) a systematic plan for therapy" , "Mere gin for a course of treatment" , "recommended diet" , "Prescribed system of diet and exercise - mere gin (anag)" .)