Coffee bar containing calcium and iron (4)
I believe the answer is:
cafe
'coffee bar' is the definition.
(synonyms)
'calcium and iron' is the wordplay.
'calcium' becomes 'Ca' (Ca is the chemical symbol for calcium).
'and' says to put letters next to each other.
'iron' becomes 'Fe' (Fe is the chemical symbol for iron).
'ca'+'fe'='CAFE'
'containing' acts as a link.
(Other definitions for cafe that I've seen before include "French coffee" , "Small informal restaurant" , "in which one had a meal?" , "Place to eat" , "A small restaurant as in France - face up to it" .)