Managed to conceal identity, on the way up from rock bottom (5)
I believe the answer is:
nadir
'rock bottom' is the definition.
(a nadir is something's lowest point)
'managed to conceal identity on the way up' is the wordplay.
'managed' becomes 'ran' (I've seen this before).
'to conceal' is an insertion indicator.
'identity' becomes 'id' (abbreviation).
'on the way up' shows that the letters should be reversed in order.
'ran' going around 'id' is 'ridan'.
'ridan' in reverse letter order is 'NADIR'.
'from' is the link.
(Other definitions for nadir that I've seen before include "most unsuccessful point" , "Very bottom, farthest from zenith" , "You can't sink lower!" , "Dinar (anag.)" , "Lower one cannot get!" .)