Baby carriers, say, losing temperature, one concludes (5)
I believe the answer is:
Here is my best explanation:
'baby carriers' is the definition.
(I've seen this before)
'say losing temperature one concludes' is the wordplay.
'say' becomes 'utter' (I've seen this before).
'losing' suggests deleting specific letters.
'temperature' becomes 't' (abbreviation).
'one' becomes 'i' (Roman numeral).
'concludes' means one lot of letters go next to another.
'utter' with 't' taken away is 'uter'.
(Other definitions for uteri that I've seen before include "several organs", "Wombs", "Developing places", "baby carriers", "Organs reproducing", "organs, in hospital patients", "Organs for girls" and "Places seeing early growth".)