The most common and most likely answer to this crossword clue is the 7 letter word CULTURE
I've seen this crossword clue in The Guardian
C
U
L
T
U
R
E
More clues leading to the result CULTURE
- Promote growth of civilisation
- River sustaining sect’s traditional way of life
- Civilisation divided, decoy blurring boundaries
- The arts of growing lab specimen?
- Growing bacteria left in wound, former practice
- Eg fungus-scavenger initially multiplied by 20
- University officer taken in by remedy for society
- Civilisation finds remedy imprisoning Unionist officer
- Experimental growth as a way of life
- Collection of micro-organisms ultimately used in treatment
Buddy explains!

The straight part
We know that "Eg fungus" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case eg fungus = culture.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CULTURE mean?
CULTURE noun- The arts, customs, lifestyles, background, and habits that characterize a particular society or nation.
- The beliefs, values, behaviour and material objects that constitute a people's way of life.
- The conventional conducts and ideologies of a community; the system comprising of the accepted norms and values of a society.
- Any knowledge passed from one generation to the next, not necessarily with respect to human beings.
- Cultivation.
- The process of growing a bacterial or other biological entity in an artificial medium.
- The growth thus produced.
- A group of bacteria.
- The details on a map that do not represent natural features of the area delineated, such as names and the symbols for towns, roads, meridians, and parallels.
- A recurring assemblage of artifacts from a specific time and place that may constitute the material culture remains of a particular past human society.
- To maintain in an environment suitable for growth (especially of bacteria) (compare cultivate)
- To increase the artistic or scientific interest (in something) (compare cultivate)