More pleasant, albeit cold-hearted (5)
I believe the answer is:
nicer
'more pleasant' is the definition.
('nice' can be similar in meaning to 'pleasant')
'albeit cold-hearted' is the wordplay.
'albeit' becomes 'nice' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'cold' becomes 'brr'.
'hearted' indicates the central letters.
The middle letter of 'brr' is 'r'.
'nice'+'r'='NICER'
Can you help me to learn more?
(Other definitions for nicer that I've seen before include "it's more appealing" , "comparatively agreeable" , "More pleasant, French resort close to Montpellier" , "More pleasing" , "more accurate" .)